Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e9a2da7c90e1b36dc4bb2a336fb448d48e9a4f0c93727305cebf3431faf1df' 
  AND token = 'k7JMUvm5xExAP3uCR2xhTHcNhOP4AZWsN+w8cS0VSAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}